From df2e260b91312474e486e7a3a79958aacd918dd2 Mon Sep 17 00:00:00 2001 From: Thomas Oettli Date: Sun, 16 Jun 2024 01:48:33 +0200 Subject: [PATCH] initial commit --- .gitignore | 16 + Cargo.toml | 18 + LICENSE | 674 +++++++++++++++++++++++++++++++ rustfmt.toml | 1 + src/header.rs | 361 +++++++++++++++++ src/headers.rs | 119 ++++++ src/lib.rs | 1047 ++++++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 2236 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.toml create mode 100644 LICENSE create mode 100644 rustfmt.toml create mode 100644 src/header.rs create mode 100644 src/headers.rs create mode 100644 src/lib.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..d761f82 --- /dev/null +++ b/.gitignore @@ -0,0 +1,16 @@ +# Generated by Cargo +# will have compiled files and executables +/target/ + +# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries +# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html +Cargo.lock + +# These are backup files generated by rustfmt +**/*.rs.bk + +# Ignore vscode config files +.vscode + +# Ignore config file +/dovecot-nextcloud-auth.toml diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..84a3109 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,18 @@ +[package] +name = "email-message" +version = "0.0.1" +authors = ["Thomas Oettli "] +edition = "2021" + +[profile.release] +lto = true +codegen-units = 1 + +[dependencies] +email = "*" +email-encoding = "*" +lettre = {version="*", features=["builder"]} +charset = "*" +mailparse = "*" +mediatype = "*" +rand = "*" diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 0000000..7530651 --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1 @@ +max_width = 120 diff --git a/src/header.rs b/src/header.rs new file mode 100644 index 0000000..a38d98d --- /dev/null +++ b/src/header.rs @@ -0,0 +1,361 @@ +use std::borrow::Cow; +use std::collections::HashMap; +use std::fmt::{self, Display, Write}; + +use charset::decode_latin1; +use email::rfc2045::Rfc2045Parser; +use email::FromHeader; +use email_encoding::headers::EmailWriter; + +fn allowed_str(s: &str) -> bool { + s.bytes().all(allowed_char) +} + +const fn allowed_char(c: u8) -> bool { + c >= 1 && c <= 9 || c == 11 || c == 12 || c >= 14 && c <= 127 +} + +struct HeaderValueEncoder<'a> { + writer: EmailWriter<'a>, + encode_buf: String, +} + +impl<'a> HeaderValueEncoder<'a> { + fn encode(name: &str, value: &'a str, f: &'a mut impl fmt::Write) -> fmt::Result { + let encoder = Self::new(name, f); + encoder.format(value.split_inclusive(' ')) + } + + fn new(name: &str, writer: &'a mut dyn Write) -> Self { + let line_len = name.len() + ": ".len(); + let writer = EmailWriter::new(writer, line_len, 0, false, false); + + Self { + writer, + encode_buf: String::new(), + } + } + + fn format(mut self, words_iter: impl Iterator) -> fmt::Result { + for next_word in words_iter { + let allowed = allowed_str(next_word); + + if allowed { + // This word only contains allowed characters + + // the next word is allowed, but we may have accumulated some words to encode + self.flush_encode_buf()?; + + self.writer.folding().write_str(next_word)?; + } else { + // This word contains unallowed characters + self.encode_buf.push_str(next_word); + } + } + + self.flush_encode_buf()?; + + Ok(()) + } + + fn flush_encode_buf(&mut self) -> fmt::Result { + if self.encode_buf.is_empty() { + // nothing to encode + return Ok(()); + } + + let prefix = self.encode_buf.trim_end_matches(' '); + email_encoding::headers::rfc2047::encode(prefix, &mut self.writer)?; + + let spaces = self.encode_buf.len() - prefix.len(); + for _ in 0..spaces { + self.writer.space(); + } + + self.encode_buf.clear(); + Ok(()) + } +} + +fn encode_header_value(key: &str, value: &str, encoded_value: &mut String) { + HeaderValueEncoder::encode(key, value, encoded_value).unwrap(); +} + +pub trait Header<'a>: Clone + Display { + fn new(key: K, value: V) -> Self; + fn from(raw_bytes: &'a [u8], key_end: usize, value_start: usize, value_end: usize) -> Self; + fn get_key_raw(&self) -> &[u8]; + fn get_value_raw(&self) -> &[u8]; + fn set_value_raw(&mut self, value: Vec); + fn serialize(&self) -> Vec>; + + fn get_key(&self) -> Cow { + decode_latin1(self.get_key_raw()) + } + + fn get_value_ref(&self) -> Cow { + // RFC 6532 says that header values can be UTF-8. Let's try that first, and + // fall back to latin1 if that fails + let value = self.get_value_raw(); + match std::str::from_utf8(value) { + Ok(s) => Cow::Borrowed(s), + Err(_) => decode_latin1(value), + } + } + + fn get_value(&self) -> String { + let raw_value = self.get_value_ref(); + let mut value = String::new(); + let mut newline = false; + for c in raw_value.chars() { + match (c, newline) { + ('\n' | '\r', false) => { + newline = true; + } + ('\n' | '\r' | '\t' | ' ', true) => (), + _ => { + if newline { + newline = false; + value.push(' '); + } + value.push(c); + } + } + } + FromHeader::from_header(value).expect("String can always be decoded") + } + + fn set_value(&mut self, value: V) { + let value = value.to_string(); + assert!(!value.is_empty()); + let mut encoded_value = String::new(); + encode_header_value(&self.get_key(), &value, &mut encoded_value); + self.set_value_raw(encoded_value.into_bytes()); + } + + fn get_param(&self, key: &str) -> Option + where + Self: Sized, + { + let header = RFC2045HeaderValue::from(self); + header.params.get(key).cloned() + } + + fn set_param(&mut self, key: K, value: V) + where + Self: Sized, + { + let key = key.to_string(); + let value = value.to_string(); + assert!(!key.is_empty()); + assert!(!value.is_empty()); + let mut rfc2045_value = RFC2045HeaderValue::from(&*self); + rfc2045_value.params.insert(key, value); + self.set_value(rfc2045_value.to_string()); + } +} + +struct RFC2045HeaderValue { + pub value: T, + pub params: HashMap, +} + +impl Display for RFC2045HeaderValue { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + match self.params.is_empty() { + true => write!(f, "{}", self.value.to_string()), + false => { + let params = self + .params + .iter() + .map(|(key, value)| { + let key = key.to_string(); + let mut encoded_value = String::new(); + encode_header_value(&key, &value.to_string(), &mut encoded_value); + format!("{key}=\"{encoded_value}\"") + }) + .collect::>(); + write!(f, "{}; {}", self.value.to_string(), params.join("; ")) + } + } + } +} + +impl<'a, T: Header<'a>> From<&'_ T> for RFC2045HeaderValue { + fn from(header: &T) -> Self { + let key = header.get_key(); + let (value, params) = match key.to_ascii_lowercase().as_str() { + "content-type" | "content-disposition" => Rfc2045Parser::new(&header.get_value()).consume_all(), + _ => (header.get_value(), HashMap::new()), + }; + + RFC2045HeaderValue { value, params } + } +} + +#[derive(Debug, Clone, PartialEq, Eq)] +pub struct CowHeader<'a> { + raw_bytes: Cow<'a, [u8]>, + key_end: usize, + value_start: usize, + value_end: usize, +} + +impl<'a> Header<'a> for CowHeader<'a> { + fn new(key: K, value: V) -> Self { + let key = key.to_string(); + let value = value.to_string(); + assert!(!key.is_empty()); + assert!(!value.is_empty()); + let mut encoded_value = String::new(); + encode_header_value(&key, &value, &mut encoded_value); + + let mut key_bytes = key.into_bytes(); + let mut value_bytes = encoded_value.into_bytes(); + + let mut raw_bytes: Vec = Vec::with_capacity(key_bytes.len() + value_bytes.len() + 4); + raw_bytes.append(&mut key_bytes); + let key_end = raw_bytes.len(); + raw_bytes.extend(b": "); + let value_start = raw_bytes.len(); + raw_bytes.append(&mut value_bytes); + let value_end = raw_bytes.len(); + raw_bytes.extend(b"\r\n"); + + Self { + raw_bytes: Cow::Owned(raw_bytes), + key_end, + value_start, + value_end, + } + } + + fn from(raw_bytes: &'a [u8], key_end: usize, value_start: usize, value_end: usize) -> Self { + Self { + raw_bytes: Cow::Borrowed(raw_bytes), + key_end, + value_start, + value_end, + } + } + + fn get_key_raw(&self) -> &[u8] { + &self.raw_bytes[0..self.key_end] + } + + fn get_value_raw(&self) -> &[u8] { + &self.raw_bytes[self.value_start..self.value_end] + } + + fn set_value_raw(&mut self, mut value: Vec) { + assert!(!value.is_empty()); + let raw_bytes = self.raw_bytes.to_mut(); + raw_bytes.truncate(self.value_start); + raw_bytes.append(&mut value); + self.value_end = raw_bytes.len(); + raw_bytes.extend(b"\r\n"); + } + + fn serialize(&self) -> Vec> { + vec![Cow::Borrowed(&self.raw_bytes)] + } +} + +impl Display for CowHeader<'_> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "{}: {}", self.get_key(), self.get_value_ref()) + } +} + +enum HeaderParseState { + Initial, + Key, + PreValue, + Value, + ValueNewline, +} + +pub fn parse_header<'a, H: Header<'a>>(raw_data: &'a [u8]) -> Result<(H, usize), &'static str> { + let mut it = raw_data.iter(); + let mut ix = 0; + let mut c = match it.next() { + None => return Err("Empty string provided"), + Some(v) => *v, + }; + + let mut ix_key_end = None; + let mut ix_value_start = 0; + let mut ix_value_end = 0; + + let mut state = HeaderParseState::Initial; + loop { + match state { + HeaderParseState::Initial => { + if c == b' ' { + return Err( + "Header cannot start with a space; it is likely an overhanging line from a previous header", + ); + }; + state = HeaderParseState::Key; + continue; + } + HeaderParseState::Key => { + if c == b':' { + ix_key_end = Some(ix); + state = HeaderParseState::PreValue; + } else if c == b'\n' { + // Technically this is invalid. We'll handle it gracefully + // since it does appear to happen in the wild and other + // MTAs deal with it. Our handling is to just treat everything + // encountered so far on this line as the header key, and + // leave the value empty. + ix_key_end = Some(ix); + ix_value_start = ix; + ix_value_end = ix; + ix += 1; + break; + } + } + HeaderParseState::PreValue => { + if c != b' ' { + ix_value_start = ix; + ix_value_end = ix; + state = HeaderParseState::Value; + continue; + } + } + HeaderParseState::Value => { + if c == b'\n' { + state = HeaderParseState::ValueNewline; + } else if c != b'\r' { + ix_value_end = ix + 1; + } + } + HeaderParseState::ValueNewline => { + if c == b' ' || c == b'\t' { + state = HeaderParseState::Value; + continue; + } else { + break; + } + } + } + ix += 1; + c = match it.next() { + None => break, + Some(v) => *v, + }; + } + match ix_key_end { + Some(v) => Ok((H::from(&raw_data[0..ix], v, ix_value_start, ix_value_end), ix)), + + None => Ok(( + // Technically this is invalid. We'll handle it gracefully + // since we handle the analogous situation above. Our handling + // is to just treat everything encountered on this line as + // the header key, and leave the value empty. + H::from(&raw_data[0..ix], ix, ix, ix), + ix, + )), + } +} diff --git a/src/headers.rs b/src/headers.rs new file mode 100644 index 0000000..24b43ac --- /dev/null +++ b/src/headers.rs @@ -0,0 +1,119 @@ +use crate::header::{Header, parse_header}; + +pub trait HeaderMap<'a, H: Header<'a>> { + fn get_all_headers(&self, key: &str) -> Vec<&H>; + fn get_all_headers_mut(&mut self, key: &str) -> Vec<&mut H>; + fn get_first_header(&self, key: &str) -> Option<&H>; + fn get_first_header_mut(&mut self, key: &str) -> Option<&mut H>; + fn get_all_values(&self, key: &str) -> Vec; + fn get_first_value(&self, key: &str) -> Option; + fn add_header(&mut self, key: K, value: V); + fn insert_header(&mut self, key: K, value: V, index: usize); + fn replace_header(&mut self, key: K, value: V, index: usize); + fn replace_all_headers(&mut self, key: K, value: V); + fn remove_header(&mut self, key: &str, index: usize); + fn remove_all_headers(&mut self, key: &str); +} + +impl<'a, H: Header<'a>> HeaderMap<'a, H> for Vec { + fn get_all_headers(&self, key: &str) -> Vec<&H> { + self.iter().filter(|h| h.get_key().eq_ignore_ascii_case(key)).collect() + } + + fn get_all_headers_mut(&mut self, key: &str) -> Vec<&mut H> { + self.iter_mut() + .filter(|h| h.get_key().eq_ignore_ascii_case(key)) + .collect() + } + + fn get_first_header(&self, key: &str) -> Option<&H> { + self.iter().find(|h| h.get_key().eq_ignore_ascii_case(key)) + } + + fn get_first_header_mut(&mut self, key: &str) -> Option<&mut H> { + self.iter_mut().find(|h| h.get_key().eq_ignore_ascii_case(key)) + } + + fn get_all_values(&self, key: &str) -> Vec { + self.get_all_headers(key).into_iter().map(|h| h.get_value()).collect() + } + + fn get_first_value(&self, key: &str) -> Option { + self.get_first_header(key).map(|h| h.get_value()) + } + + fn add_header(&mut self, key: K, value: V) { + self.push(H::new(key, value)) + } + + fn insert_header(&mut self, key: K, value: V, index: usize) { + let index = std::cmp::min(index, self.len()); + let header = H::new(key, value); + self.insert(index, header); + } + + fn replace_all_headers(&mut self, key: K, value: V) { + let key = key.to_string(); + for header in self { + if !header.get_key().eq_ignore_ascii_case(&key) { + continue; + } + header.set_value(value.to_string()); + } + } + + fn replace_header(&mut self, key: K, value: V, index: usize) { + let key = key.to_string(); + let mut count: usize = 0; + for header in self { + if !header.get_key().eq_ignore_ascii_case(&key) { + continue; + } + if count == index { + header.set_value(value); + break; + } + count += 1; + } + } + + fn remove_all_headers(&mut self, key: &str) { + self.retain(|h| !h.get_key().eq_ignore_ascii_case(key)); + } + + fn remove_header(&mut self, key: &str, index: usize) { + if let Some((index, _)) = self + .iter() + .enumerate() + .filter(move |h| h.1.get_key().eq_ignore_ascii_case(key)) + .nth(index) + { + self.remove(index); + } + } +} + + +pub fn parse_headers<'a, H: Header<'a>>(raw_data: &'a [u8]) -> Result<(Vec, usize), &'static str> { + let mut headers: Vec = Vec::new(); + let mut ix = 0; + loop { + if ix >= raw_data.len() { + break; + } else if raw_data[ix] == b'\n' { + ix += 1; + break; + } else if raw_data[ix] == b'\r' { + if ix + 1 < raw_data.len() && raw_data[ix + 1] == b'\n' { + ix += 2; + break; + } else { + return Err("Headers were followed by an unexpected lone CR character!"); + } + } + let (header, ix_next) = parse_header(&raw_data[ix..]).unwrap(); + headers.push(header); + ix += ix_next; + } + Ok((headers, ix)) +} \ No newline at end of file diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..a34c4a4 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,1047 @@ +#![forbid(unsafe_code)] + +pub mod header; +pub mod headers; +use header::CowHeader; +pub use header::Header; +use headers::parse_headers; +pub use headers::HeaderMap; + +use lettre::message::header::ContentTransferEncoding; +use lettre::message::MaybeString; +use mailparse::{ + body::Body, parse_content_disposition, parse_content_type, DispositionType, MailParseError, + ParsedContentDisposition, ParsedContentType, +}; +use mediatype::{names::*, MediaType, MediaTypeBuf, Name}; +use rand::{distributions::Alphanumeric, thread_rng, Rng as _}; +use std::borrow::Cow; +use std::boxed::Box; +use std::ops::Deref; + +#[derive(Debug)] +pub enum CowMailError { + Generic(String), + MailParseError(MailParseError), + MissingContentTypeHeader, +} + +impl std::error::Error for CowMailError {} + +impl std::fmt::Display for CowMailError { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + match self { + Self::Generic(error) => write!(f, "{}", error), + Self::MailParseError(error) => write!(f, "{}", error), + Self::MissingContentTypeHeader => write!(f, "missing ContentType header"), + } + } +} + +impl From for CowMailError { + fn from(error: MailParseError) -> Self { + Self::MailParseError(error) + } +} + +#[derive(Debug, Clone, PartialEq, Eq)] +pub enum BodyType { + RELATED, + HTML, + PLAIN, +} + +impl From<&BodyType> for Name<'_> { + fn from(btype: &BodyType) -> Self { + match btype { + BodyType::PLAIN => PLAIN, + BodyType::HTML => HTML, + BodyType::RELATED => RELATED, + } + } +} + +#[derive(Debug, Clone, PartialEq, Eq)] +pub enum MessageType { + SinglePart, + MultiPart(String), +} + +#[derive(Debug, Default)] +pub struct ContentType { + ctype: ParsedContentType, +} + +impl ContentType { + pub fn default_conditional(in_multipart_digest: bool) -> Self { + let mut ctype = ParsedContentType::default(); + if in_multipart_digest { + ctype.mimetype = "message/rfc822".to_string(); + } + Self { ctype } + } +} + +impl Clone for ContentType { + fn clone(&self) -> Self { + Self { + ctype: ParsedContentType { + mimetype: self.ctype.mimetype.clone(), + charset: self.ctype.charset.clone(), + params: self.ctype.params.clone(), + }, + } + } +} + +impl Deref for ContentType { + type Target = ParsedContentType; + + fn deref(&self) -> &Self::Target { + &self.ctype + } +} + +impl From for ContentType { + fn from(ctype: ParsedContentType) -> Self { + Self { ctype } + } +} + +impl From<&str> for ContentType { + fn from(value: &str) -> Self { + parse_content_type(value).into() + } +} + +pub trait Mail<'a, T: Header<'a>>: HeaderMap<'a, T> { + fn clear(&mut self); + fn clear_content(&mut self); + fn default_ctype(&self) -> ContentType; + fn raw_body(&self) -> &[u8]; + fn raw_body_mut(&mut self) -> &mut Vec; + + fn get_content_type(&self) -> ContentType { + self.get_first_header("Content-Type") + .map(|h| ContentType::from(h.get_value_ref().as_ref())) + .unwrap_or_else(|| self.default_ctype()) + } + + fn message_type(&self) -> MessageType { + let ctype = self.get_content_type(); + match ctype.mimetype.parse::() { + Ok(mtype) => { + let mut res = MessageType::SinglePart; + if mtype.ty() == MULTIPART { + if let Some(boundary) = ctype.params.get("boundary") { + res = MessageType::MultiPart(boundary.clone()); + } + } + res + } + Err(_) => MessageType::SinglePart, + } + } + + fn is_multipart(&self) -> bool { + match self.message_type() { + MessageType::SinglePart => false, + MessageType::MultiPart(_) => true, + } + } + + fn get_content_disposition(&self) -> Option { + if let Some(header) = self.get_first_header("Content-Disposition") { + let value = header.get_value(); + return Some(parse_content_disposition(&value)); + } + None + } + + fn is_attachment(&self) -> bool { + match self.get_content_disposition() { + Some(disp) => matches!(disp.disposition, DispositionType::Attachment), + None => false, + } + } + + fn get_content(&self) -> Result { + let ctype = self.get_content_type(); + let transfer_encoding = self.get_first_value("Content-Transfer-Encoding"); + match self.get_content_encoded(&ctype, &transfer_encoding) { + Body::Base64(body) | Body::QuotedPrintable(body) => Ok(body.get_decoded_as_string()?), + Body::SevenBit(body) | Body::EightBit(body) => Ok(body.get_as_string()?), + Body::Binary(body) => Ok(body.get_as_string()?), + } + } + + fn get_content_raw(&self) -> Result, CowMailError> { + let ctype = self.get_content_type(); + let transfer_encoding = self.get_first_value("Content-Transfer-Encoding"); + match self.get_content_encoded(&ctype, &transfer_encoding) { + Body::Base64(body) | Body::QuotedPrintable(body) => Ok(body.get_decoded()?), + Body::SevenBit(body) | Body::EightBit(body) => Ok(Vec::::from(body.get_raw())), + Body::Binary(body) => Ok(Vec::from(body.get_raw())), + } + } + + fn get_content_encoded<'b>(&'b self, ctype: &'b ContentType, transfer_encoding: &Option) -> Body<'b> { + Body::new(self.raw_body(), ctype, transfer_encoding) + } + +} + + + + + + +pub fn generate_boundary() -> String { + thread_rng() + .sample_iter(&Alphanumeric) + .take(68) + .map(char::from) + .collect::() +} + +#[derive(Debug, Clone)] +pub struct CowMail<'a, H: Header<'a>> { + pub headers: Vec, + pub body_bytes: Cow<'a, [u8]>, + pub subparts: Vec>, + pub end_bytes: &'a [u8], + pub default_ctype: ContentType, +} + +impl<'a> Default for CowMail<'a, CowHeader<'a>> { + fn default() -> Self { + CowMail::new() + } +} + +impl<'a, H: Header<'a>> CowMail<'a, H> { + pub fn new() -> Self { + Self { + headers: Vec::new(), + body_bytes: Cow::Borrowed(&[]), + subparts: Vec::new(), + end_bytes: b"\r\n", + default_ctype: ContentType::default(), + } + } + + pub fn clear(&mut self) { + self.headers.clear(); + self.body_bytes = Cow::Borrowed(&[]); + self.subparts.clear(); + self.end_bytes = b"\r\n"; + } + + pub fn clear_content(&mut self) { + self.headers + .retain(|h| !h.get_key().to_ascii_lowercase().starts_with("content-")); + self.body_bytes = Cow::Borrowed(&[]); + self.subparts.clear(); + self.end_bytes = b"\r\n"; + } + + pub fn get_content_type(&self) -> ContentType { + self.get_first_header("Content-Type") + .map(|h| ContentType::from(h.get_value_ref().as_ref())) + .unwrap_or_else(|| self.default_ctype.clone()) + } + + fn get_mime_type(&self) -> MediaTypeBuf { + self.get_content_type() + .mimetype + .parse::() + .unwrap_or_else(|_| MediaTypeBuf::new(TEXT, PLAIN)) + } + + pub fn message_type(&self) -> MessageType { + let ctype = self.get_content_type(); + match ctype.mimetype.parse::() { + Ok(mtype) => { + let mut res = MessageType::SinglePart; + if mtype.ty() == MULTIPART { + if let Some(boundary) = ctype.params.get("boundary") { + res = MessageType::MultiPart(boundary.clone()); + } + } + res + } + Err(_) => MessageType::SinglePart, + } + } + + pub fn is_multipart(&self) -> bool { + match self.message_type() { + MessageType::SinglePart => false, + MessageType::MultiPart(_) => true, + } + } + + pub fn get_content_disposition(&self) -> Option { + if let Some(header) = self.get_first_header("Content-Disposition") { + let value = header.get_value(); + return Some(parse_content_disposition(&value)); + } + None + } + + pub fn is_attachment(&self) -> bool { + match self.get_content_disposition() { + Some(disp) => matches!(disp.disposition, DispositionType::Attachment), + None => false, + } + } + + pub fn get_content(&self) -> Result { + let ctype = self.get_content_type(); + let transfer_encoding = self.headers.get_first_value("Content-Transfer-Encoding"); + match self.get_content_encoded(&ctype, &transfer_encoding) { + Body::Base64(body) | Body::QuotedPrintable(body) => Ok(body.get_decoded_as_string()?), + Body::SevenBit(body) | Body::EightBit(body) => Ok(body.get_as_string()?), + Body::Binary(body) => Ok(body.get_as_string()?), + } + } + + pub fn get_content_raw(&self) -> Result, CowMailError> { + let ctype = self.get_content_type(); + let transfer_encoding = self.headers.get_first_value("Content-Transfer-Encoding"); + match self.get_content_encoded(&ctype, &transfer_encoding) { + Body::Base64(body) | Body::QuotedPrintable(body) => Ok(body.get_decoded()?), + Body::SevenBit(body) | Body::EightBit(body) => Ok(Vec::::from(body.get_raw())), + Body::Binary(body) => Ok(Vec::from(body.get_raw())), + } + } + + pub fn get_content_encoded<'b>(&'b self, ctype: &'b ContentType, transfer_encoding: &Option) -> Body<'b> { + Body::new(&self.body_bytes, ctype, transfer_encoding) + } + + pub fn set_content(&mut self, content: T, ctype: Option) { + self.clear_content(); + let body = lettre::message::Body::new(content.to_string()); + + let ctype = ctype + .unwrap_or_else(|| MediaType::new(TEXT, PLAIN)) + .essence() + .to_string(); + self.headers + .add_header("Content-Type", format!("{}; charset=\"UTF-8\"", ctype)); + + let encoding = body.encoding(); + if encoding != ContentTransferEncoding::SevenBit { + self.headers.add_header("Content-Transfer-Encoding", encoding); + } + + self.body_bytes = Cow::Owned(body.into_vec()); + } + + pub fn set_content_raw, T: ToString>(&mut self, content: B, ctype: Option) { + self.clear_content(); + let body = lettre::message::Body::new(content); + + if let Some(ctype) = ctype { + self.headers.add_header("Content-Type", ctype); + } + + let encoding = body.encoding(); + if encoding != ContentTransferEncoding::SevenBit { + self.headers.add_header("Content-Transfer-Encoding", encoding); + } + + self.body_bytes = Cow::Owned(body.into_vec()); + } + + pub fn get_filename(&self) -> Option { + self.get_content_disposition() + .and_then(|disp| disp.params.get("filename").cloned()) + .or_else(|| self.get_content_type().params.get("name").cloned()) + } + + pub fn get_boundary(&self) -> Option { + self.headers + .get_first_header("Content-Type") + .and_then(|h| h.get_param("boundary")) + } + + pub fn set_boundary(&mut self, boundary: T) -> Result<(), CowMailError> { + let header = self + .headers + .get_first_header_mut("Content-Type") + .ok_or(CowMailError::MissingContentTypeHeader)?; + header.set_param("boundary", boundary.to_string()); + Ok(()) + } + + fn contains_body(&self, mime: &MediaTypeBuf, subty: &Name) -> Option { + match self.is_multipart() { + false => Some(!self.is_attachment() && mime.ty() == TEXT && mime.subty().eq(subty)), + true if *subty == RELATED && mime.subty() == RELATED => Some(true), + _ if self.subparts.is_empty() => Some(false), + _ => None, + } + } + + fn get_related_candidate(&self) -> usize { + self.get_content_type() + .params + .get("start") + .and_then(|start| { + self.subparts.iter().position(|part| { + part.headers + .get_first_value("Content-ID") + .map(|cid| cid.eq(start)) + .unwrap_or(false) + }) + }) + .unwrap_or_default() + } + + pub fn get_body_part(&self, bodytype: &BodyType) -> Option<&'a CowMail> { + let subty = Name::from(bodytype); + let mime = self.get_mime_type(); + + match self.contains_body(&mime, &subty) { + Some(res) => match res { + true => Some(self), + false => None, + }, + None => { + if mime.subty() != RELATED { + self.subparts.iter().find_map(|p| p.get_body_part(bodytype)) + } else { + let candidate = self.get_related_candidate(); + self.subparts[candidate].get_body_part(bodytype) + } + } + } + } + + pub fn get_body_part_mut(&mut self, bodytype: &BodyType) -> Option<&mut CowMail<'a, H>> { + let subty = Name::from(bodytype); + let mime = self.get_mime_type(); + match self.contains_body(&mime, &subty) { + Some(res) => match res { + true => Some(self), + false => None, + }, + None => { + if mime.subty() != RELATED { + self.subparts.iter_mut().find_map(|p| p.get_body_part_mut(bodytype)) + } else { + let candidate = self.get_related_candidate(); + self.subparts[candidate].get_body_part_mut(bodytype) + } + } + } + } + + fn make_multipart(&mut self, to_type: Name, boundary: Option) -> Result<(), CowMailError> { + let ctype = self.get_mime_type(); + if ctype.ty() == MULTIPART { + let subtype = ctype.subty(); + if subtype == to_type + || (to_type == ALTERNATIVE && subtype == MIXED) + || (to_type == RELATED && [ALTERNATIVE, MIXED].contains(&subtype)) + { + return Err(CowMailError::Generic(format!( + "cannot convert {} to multipart/{}", + ctype.essence(), + to_type + ))); + } + } + + let mut subpart = CowMail::new(); + + let mut ix = 0; + while ix < self.headers.len() { + if self.headers[ix].get_key().to_ascii_lowercase().starts_with("content-") { + subpart.headers.push(self.headers.remove(ix)); + } else { + ix += 1; + } + } + match &mut self.body_bytes { + Cow::Borrowed(body_bytes) => subpart.body_bytes = Cow::Borrowed(*body_bytes), + Cow::Owned(body_bytes) => subpart.body_bytes.to_mut().append(body_bytes), + }; + self.body_bytes = Cow::Borrowed(&[]); + + subpart.subparts.append(&mut self.subparts); + + subpart.end_bytes = self.end_bytes; + self.end_bytes = b"\r\n"; + + if self.headers.get_first_header("MIME-Version").is_none() { + self.headers.add_header("MIME-Version", "1.0"); + } + + self.headers.add_header( + "Content-Type", + format!( + "multipart/{to_type}; boundary=\"{}\"", + boundary.unwrap_or_else(generate_boundary) + ), + ); + + self.subparts.push(subpart); + Ok(()) + } + + pub fn make_mixed(&mut self, boundary: Option) -> Result<(), CowMailError> { + self.make_multipart(MIXED, boundary) + } + + pub fn make_alternative(&mut self, boundary: Option) -> Result<(), CowMailError> { + self.make_multipart(ALTERNATIVE, boundary) + } + + pub fn make_related(&mut self, boundary: Option) -> Result<(), CowMailError> { + self.make_multipart(RELATED, boundary) + } + + fn add_multipart(&mut self, subpart: CowMail<'a, H>, ctype: MediaType) -> Result<(), CowMailError> { + match self.is_multipart() { + false => { + self.make_multipart(ctype.subty, None)?; + self.subparts.push(subpart); + } + true => { + let existing_ctype = self.get_mime_type(); + if existing_ctype.ty() == MULTIPART && existing_ctype != ctype { + self.make_multipart(ctype.subty, None)?; + self.subparts.push(subpart); + } else { + self.subparts.push(subpart); + } + } + } + Ok(()) + } + + pub fn add_related(&mut self, mut subpart: CowMail<'a, H>) -> Result<(), CowMailError> { + if subpart.headers.get_first_header("Content-Disposition").is_none() { + subpart.headers.add_header("Content-Disposition", "inline"); + } + self.add_multipart(subpart, MediaType::new(MULTIPART, RELATED)) + } + + pub fn add_alternative(&mut self, subpart: CowMail<'a, H>) -> Result<(), CowMailError> { + self.add_multipart(subpart, MediaType::new(MULTIPART, ALTERNATIVE)) + } + + pub fn add_attachment(&mut self, mut subpart: CowMail<'a, H>) -> Result<(), CowMailError> { + if subpart.headers.get_first_header("Content-Disposition").is_none() { + subpart.headers.add_header("Content-Disposition", "attachment"); + } + self.add_multipart(subpart, MediaType::new(MULTIPART, MIXED)) + } + + pub fn serialize_headers(&self) -> Vec> { + let mut res: Vec> = self.headers.iter().flat_map(|h| h.serialize()).collect(); + res.push(Cow::Borrowed(b"\r\n")); + res + } + + pub fn serialize_body(&self) -> Vec> { + match self.message_type() { + MessageType::SinglePart => match self.body_bytes { + Cow::Borrowed(body_bytes) => vec![Cow::Borrowed(body_bytes)], + Cow::Owned(_) => vec![Cow::Borrowed(&self.body_bytes), Cow::Borrowed(self.end_bytes)], + }, + MessageType::MultiPart(boundary) => std::iter::once(vec![Cow::Borrowed(&*self.body_bytes)]) + .chain(self.subparts.iter().map(|p| { + let mut res = vec![ + Cow::Borrowed("--".as_bytes()), + Cow::Owned(boundary.as_bytes().to_owned()), + Cow::Borrowed("\r\n".as_bytes()), + ]; + res.append(&mut p.serialize()); + res + })) + .chain(std::iter::once(vec![ + Cow::Borrowed("--".as_bytes()), + Cow::Owned(boundary.as_bytes().to_owned()), + Cow::Borrowed("--".as_bytes()), + Cow::Borrowed(self.end_bytes), + ])) + .flatten() + .collect(), + } + } + + pub fn serialize(&self) -> Vec> { + let mut res = self.serialize_headers(); + res.append(&mut self.serialize_body()); + res + } +} + +impl<'a, H: Header<'a>> HeaderMap<'a, H> for CowMail<'a, H> { + fn get_all_headers(&self, key: &str) -> Vec<&H> { + self.headers.get_all_headers(key) + } + + fn get_all_headers_mut(&mut self, key: &str) -> Vec<&mut H> { + self.headers.get_all_headers_mut(key) + } + + fn get_first_header(&self, key: &str) -> Option<&H> { + self.headers.get_first_header(key) + } + + fn get_first_header_mut(&mut self, key: &str) -> Option<&mut H> { + self.headers.get_first_header_mut(key) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, HeaderMap}; + /// let mail = CowMail::try_from(concat!( + /// "Subject: Test\n", + /// "Subject: Test1\n", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// let mut values = mail.get_all_values("Subject").into_iter(); + /// assert_eq!(values.next().unwrap(), "Test"); + /// assert_eq!(values.next().unwrap(), "Test1"); + /// assert!(values.next().is_none()); + /// ``` + fn get_all_values(&self, key: &str) -> Vec { + self.headers.get_all_values(key) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, HeaderMap}; + /// let mail = CowMail::try_from(concat!( + /// "Subject: Test\n", + /// "Subject: Test1", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// assert_eq!(mail.get_first_value("Subject").unwrap(), "Test"); + /// ``` + fn get_first_value(&self, key: &str) -> Option { + self.headers.get_first_value(key) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, HeaderMap}; + /// let mut mail = CowMail::default(); + /// mail.add_header("Subject", "Test"); + /// assert_eq!(mail.get_first_value("Subject").unwrap(), "Test"); + /// ``` + fn add_header(&mut self, key: K, value: V) { + self.headers.add_header(key, value) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, Header, HeaderMap}; + /// let mut mail = CowMail::try_from(concat!( + /// "Subject: Test\n", + /// "To: \"John Doe\" \n", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// mail.insert_header("From", "\"me\" ", 1); + /// assert_eq!(mail.headers[0].get_key(), "Subject"); + /// assert_eq!(mail.headers[1].get_key(), "From"); + /// assert_eq!(mail.headers[2].get_key(), "To"); + /// ``` + fn insert_header(&mut self, key: K, value: V, index: usize) { + self.headers.insert_header(key, value, index) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, Header, HeaderMap}; + /// let mut mail = CowMail::try_from(concat!( + /// "Subject: Test\n", + /// "To: \"John Doe\" \n", + /// "Subject: Test1\n", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// mail.replace_all_headers("Subject", "Test2"); + /// assert_eq!(mail.headers[0].get_value_ref(), "Test2"); + /// assert_eq!(mail.headers[1].get_value_ref(), "\"John Doe\" "); + /// assert_eq!(mail.headers[2].get_value_ref(), "Test2"); + /// ``` + fn replace_all_headers(&mut self, key: K, value: V) { + self.headers.replace_all_headers(key, value) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, Header, HeaderMap}; + /// let mut mail = CowMail::try_from(concat!( + /// "Subject: Test1\n", + /// "To: \"John Doe\" \n", + /// "Subject: Test2\n", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// mail.replace_header("Subject", "Test3", 0); + /// mail.replace_header("Subject", "Test4", 1); + /// assert_eq!(mail.headers[0].get_value_ref(), "Test3"); + /// assert_eq!(mail.headers[1].get_value_ref(), "\"John Doe\" "); + /// assert_eq!(mail.headers[2].get_value_ref(), "Test4"); + /// ``` + fn replace_header(&mut self, key: K, value: V, index: usize) { + self.headers.replace_header(key, value, index) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, Header, HeaderMap}; + /// let mut mail = CowMail::try_from(concat!( + /// "Subject: Test1\n", + /// "To: \"John Doe\" \n", + /// "Subject: Test2\n", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// mail.remove_all_headers("Subject"); + /// assert_eq!(mail.headers.len(), 1); + /// assert_eq!(mail.headers[0].get_value_ref(), "\"John Doe\" "); + /// ``` + fn remove_all_headers(&mut self, key: &str) { + self.headers.remove_all_headers(key) + } + + /// Examples + /// ``` + /// use email_message::{CowMail, Header, HeaderMap}; + /// let mut mail = CowMail::try_from(concat!( + /// "Subject: Test1\n", + /// "To: \"John Doe\" \n", + /// "Subject: Test2\n", + /// "\n", + /// "This is a test message").as_bytes()) + /// .unwrap(); + /// mail.remove_header("Subject", 1); + /// assert_eq!(mail.headers.len(), 2); + /// assert_eq!(mail.headers[0].get_value_ref(), "Test1"); + /// ``` + fn remove_header(&mut self, key: &str, index: usize) { + self.headers.remove_header(key, index) + } +} + +impl<'a> TryFrom<&'a [u8]> for CowMail<'a, CowHeader<'a>> { + type Error = &'static str; + + fn try_from(raw_data: &'a [u8]) -> Result { + parse_mail(raw_data) + } +} + +pub struct CowMailReader<'a> { + headers: Box> + 'a>, + body: Box> + 'a>, + current: Option>>, +} + +impl<'a> CowMailReader<'a> { + pub fn new>(msg: &'a CowMail<'a, H>) -> CowMailReader<'a> { + CowMailReader::from(msg) + } + + pub fn skip_headers(&mut self) { + self.headers = Box::new(std::iter::empty()); + } + + pub fn skip_body(&mut self) { + self.body = Box::new(std::iter::empty()); + } +} + +impl<'a, H: Header<'a>> From<&'a CowMail<'a, H>> for CowMailReader<'a> { + fn from(msg: &'a CowMail<'a, H>) -> Self { + CowMailReader { + headers: Box::new(msg.serialize_headers().into_iter()), + body: Box::new(msg.serialize_body().into_iter()), + current: None, + } + } +} + +impl std::io::Read for CowMailReader<'_> { + fn read(&mut self, buf: &mut [u8]) -> std::io::Result { + let buf_size = buf.len(); + let mut bytes_written: usize = 0; + + while buf_size - bytes_written > 0 { + if let Some(cur) = &mut self.current { + let chunk_size = cur.read(&mut buf[bytes_written..])?; + if chunk_size > 0 { + bytes_written += chunk_size; + continue; + } + self.current = None; + } + + match self.headers.next().or_else(|| self.body.next()) { + Some(data) => self.current = Some(std::io::Cursor::new(data)), + None => break, + } + } + Ok(bytes_written) + } +} + +pub fn parse_mail<'a, H: Header<'a>>(raw_data: &'a [u8]) -> Result, &'static str> { + parse_mail_recursive(raw_data, false) +} + +fn parse_mail_recursive<'a, H: Header<'a>>( + raw_data: &'a [u8], + mut in_multipart_digest: bool, +) -> Result, &'static str> { + let (headers, body_idx) = parse_headers::(raw_data)?; + + let default_ctype = ContentType::default_conditional(in_multipart_digest); + + let ctype = headers + .get_first_value("Content-Type") + .map(|s| ContentType::from(s.as_str())) + .unwrap_or(default_ctype.clone()); + + let mut mail = CowMail { + headers, + body_bytes: Cow::Borrowed(&raw_data[body_idx..]), + subparts: Vec::new(), + end_bytes: &[], + default_ctype, + }; + + if ctype.mimetype.starts_with("multipart/") && ctype.params.get("boundary").is_some() && raw_data.len() > body_idx { + in_multipart_digest = ctype.mimetype == "multipart/digest"; + let boundary = String::from("--") + &ctype.params["boundary"]; + if let Some(body_end_idx) = find_from_u8_line_prefix(raw_data, body_idx, boundary.as_bytes()) { + mail.body_bytes = Cow::Borrowed(&raw_data[body_idx..body_end_idx]); + let mut boundary_end_idx = body_end_idx + boundary.len(); + while let Some(part_start_idx) = find_from_u8(raw_data, boundary_end_idx, b"\n").map(|v| v + 1) { + let part_end_idx = + find_from_u8_line_prefix(raw_data, part_start_idx, boundary.as_bytes()).unwrap_or(raw_data.len()); + mail.subparts.push(parse_mail_recursive( + &raw_data[part_start_idx..part_end_idx], + in_multipart_digest, + )?); + boundary_end_idx = part_end_idx + boundary.len(); + if boundary_end_idx + 2 > raw_data.len() + || (raw_data[boundary_end_idx] == b'-' && raw_data[boundary_end_idx + 1] == b'-') + { + boundary_end_idx += 2; + if boundary_end_idx < raw_data.len() { + mail.end_bytes = &raw_data[boundary_end_idx..]; + } + break; + } + } + } + } + Ok(mail) +} + +// Like find_from_u8, but additionally filters such that `key` is at the start +// of a line (preceded by `\n`) or at the start of the search space. +fn find_from_u8_line_prefix(line: &[u8], ix_start: usize, key: &[u8]) -> Option { + let mut start = ix_start; + while let Some(ix) = find_from_u8(line, start, key) { + if ix == ix_start || line[ix - 1] == b'\n' { + return Some(ix); + } + start = ix + 1; + } + None +} + +fn find_from_u8(line: &[u8], ix_start: usize, key: &[u8]) -> Option { + assert!(!key.is_empty()); + assert!(ix_start < line.len()); + if line.len() < key.len() { + return None; + } + let ix_end = line.len() - key.len(); + if ix_start <= ix_end { + for i in ix_start..ix_end { + if line[i] == key[0] { + let mut success = true; + for j in 1..key.len() { + if line[i + j] != key[j] { + success = false; + break; + } + } + if success { + return Some(i); + } + } + } + } + None +} + +#[cfg(test)] +mod tests { + //use std::io::{Read, Write}; + + use crate::{CowHeader, CowMail, Header, HeaderMap}; + use mediatype::{names::*, MediaType}; + + #[test] + fn test_header_mutations() { + let mut mail = CowMail::::new(); + assert_eq!(mail.headers.len(), 0); + + let test_headers = vec![ + ("X-Test", "Test"), + ("X-Another-Test", "Another"), + ("X-Test", "Test2"), + ("X-Another-Test", "Another1"), + ("X-Test", "Test3"), + ]; + + for (key, value) in test_headers.iter() { + mail.add_header(key, value); + } + + assert_eq!(mail.headers.len(), test_headers.len()); + for (idx, header) in mail.headers.iter().enumerate() { + assert_eq!(header.get_key(), test_headers[idx].0); + assert_eq!(header.get_value(), test_headers[idx].1); + } + + mail.insert_header("X-Test", "Test1", 1); + assert_eq!(mail.get_all_values("X-Test"), ["Test", "Test1", "Test2", "Test3"]); + + mail.replace_all_headers("X-Test", "Test555"); + assert_eq!( + mail.get_all_values("X-Test"), + ["Test555", "Test555", "Test555", "Test555"] + ); + + mail.replace_header("X-Test", "Test", 0); + mail.replace_header("X-Test", "Test1", 1); + mail.replace_header("X-Test", "Test2", 2); + mail.replace_header("X-Test", "Test3", 3); + assert_eq!(mail.get_all_values("X-Test"), ["Test", "Test1", "Test2", "Test3"]); + + mail.remove_header("X-Test", 1); + assert_eq!(mail.get_all_values("X-Test"), ["Test", "Test2", "Test3"]); + mail.remove_all_headers("X-Test"); + assert_eq!(mail.headers.len(), 2); + } + + #[test] + fn test_body_mutations() { + let mut mail = + CowMail::try_from(concat!("Content-Type: text/plain\n", "\n", "This is a test message").as_bytes()) + .unwrap(); + let ctype = mail.get_content_type(); + assert_eq!(ctype.mimetype, "text/plain"); + assert_eq!(ctype.charset, "us-ascii"); + assert_eq!(mail.is_multipart(), false); + assert_eq!(mail.get_content().unwrap(), "This is a test message"); + + mail.clear_content(); + assert!(mail.get_first_header("Content-Type").is_none()); + assert_eq!(mail.get_content().unwrap(), ""); + mail.set_content("This is a new test message\n".to_string(), None); + + let ctype = mail.get_content_type(); + assert_eq!(ctype.mimetype, "text/plain"); + assert_eq!(ctype.charset, "UTF-8"); + + mail.add_header("From", "\"John Doe\" "); + + let mut html = CowMail::new(); + html.set_content( + "This is a new test message ☺".to_string(), + Some(MediaType::new(TEXT, HTML)), + ); + + mail.add_alternative(html).unwrap(); + let alt_boundary = mail.get_boundary().unwrap(); + + let ctype = mail.get_content_type(); + assert_eq!(ctype.mimetype, "multipart/alternative"); + assert_eq!(ctype.params.get("boundary").unwrap(), &alt_boundary); + assert_eq!( + mail.get_first_header("Content-Type").unwrap().get_value(), + format!("multipart/alternative; boundary=\"{}\"", alt_boundary) + ); + + let mut attachment = CowMail::new(); + attachment.set_content("This is a test text file".to_string(), None); + let mut disp = CowHeader::new("Content-Disposition", "attachment"); + disp.set_param("filename", "Test☺File.html"); + attachment.headers.push(disp); + mail.add_attachment(attachment).unwrap(); + + let mixed_boundary = mail.get_boundary().unwrap(); + let encoded = mail + .serialize() + .iter() + .flat_map(|p| p.into_iter()) + .cloned() + .collect::>(); + + let expected = format!( + "From: \"John Doe\" \r\n\ + MIME-Version: 1.0\r\n\ + Content-Type: multipart/mixed;\r\n boundary=\"{mixed_boundary}\"\r\n\ + \r\n\ + --{mixed_boundary}\r\n\ + Content-Type: multipart/alternative;\r\n boundary=\"{alt_boundary}\"\r\n\ + \r\n\ + --{alt_boundary}\r\n\ + Content-Type: text/plain; charset=\"UTF-8\"\r\n\ + \r\n\ + This is a new test message\r\n\ + \r\n\ + --{alt_boundary}\r\n\ + Content-Type: text/html; charset=\"UTF-8\"\r\n\ + Content-Transfer-Encoding: quoted-printable\r\n\ + \r\n\ + This is a new test message =E2=98=BA\r\n\ + --{alt_boundary}--\r\n\ + --{mixed_boundary}\r\n\ + Content-Type: text/plain; charset=\"UTF-8\"\r\n\ + Content-Disposition: attachment;\r\n filename=\"=?utf-8?b?VGVzdOKYukZpbGUuaHRtbA==?=\"\r\n\ + \r\n\ + This is a test text file\r\n\ + --{mixed_boundary}--\r\n" + ); + let expected = expected.into_bytes(); + + assert_eq!(encoded, expected); + + /* + let mut f = std::fs::File::open("/tmp/test.eml").unwrap(); + let mut data = Vec::new(); + f.read_to_end(&mut data).unwrap(); + + let mail = CowMail::try_from(&data[..]).unwrap(); + let mut serialized = mail + .serialize() + .iter() + .flat_map(|p| p.into_iter()) + .cloned() + .collect::>(); + + assert_eq!(data, serialized); + let mut f = std::fs::File::create("/tmp/test1.eml").unwrap(); + f.write_all(&mut serialized).unwrap(); + */ + } +}